Dead Reckoning Altitude and Azimuth Table (H.O. No. 211)

United States Government Printing Office, 1933. Hardcover, 49, [3] pp.; 24 cm; Second Edition; text diagrams and worked problem forms, navigation tables printed on endpapers, fore-edge thumb index. Issued by the United States Navy Department Hydrographic Office as H.O. No. 211; preface by Rear Admiral W. R. Gherardi, Hydrographer. In Very Good condition, no dust jacket. Green cloth with gilt-ruled panels and gilt lettering on front; mild shelf wear and edgewear, some color loss at corner tips and along spine and joints; some scuffing to front cover. Binding tight. Thumb index complete. Pencil notes in margin of front pastedown giving latitude and longitude of San Diego Light. Pages mildly to moderately toned, otherwise unmarked. The Second Edition of the Ageton tables, a method of celestial navigation in which sights are worked directly from the dead reckoning position using log secant and cosecant tables, with no interpolation. Lieutenant Arthur A. Ageton devised the method while a member of the Line Class of the Postgraduate School at the Naval Academy, and the tables became known to navigators simply as "Ageton." This edition adds two problems for use with the new Air Almanac of 1933 and expands the section on great circle sailing. The worked problems are set aboard the Navy airships U.S.S. Akron and U.S.S. Macon, the battleship U.S.S. Pennsylvania, and an aircraft using a bubble sextant, with further sections on star identification, compass error, time of the sun on the prime vertical, and reduction to the meridian. Endpaper tables give time into arc, bubble sextant corrections, corrections for sun, star and moon, and height of eye. Ageton later retired as a rear admiral and served as United States Ambassador to Paraguay from 1954 to 1957.…